Multiple-valve-grinding machine



R. M. ROOF. MULTIPLEYVALVE GRINDING MACHINE.

APPLICATION FILED OCT. 29. 1920.

Patented July 25, 1922.

2 SHEETS-SHEET l- INVENTOR. Ease/er /7. Ever.

' A TTORNEYS R. M..RO0F.

MULTIPLE VALVE GRINDING MACHINE.

APPLICATION FILED OCT. 29, I920.

Patented July 25, 1922.

2 SHEETS-SHEET 2.

INVENTOR. 0865 M E00:

I BY

I L-J. 1/14 m M ATTORNEYS stres ROBERT M. ROOF, 01E ANDERSON, INDIANA.

Specification of. Letters Patent.

Patented July 25, 1922.

Application filed October 29, 1920. Serial No. 420,459.

To all whom it may concern Be it known that 1, ROBERT M. R001, a citizenof the United States, and a resident of Anderson, county of Madison, andState of Indiana, have invented a certain new and usefulMultiple-Valve-Grinding Machine; 2 and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings in which like numerals refer tolike parts.

This invention relates to valve grinding machines, and in particular topower driven machines.

The chief object of this invention is to provide a machine which isadapted to simultaneously grind a plurality of valves of an internalcombustion engine.

The chief feature of the invention consists in the means forsimultaneously grinding a plurality of valves, and for rotating saidvalves simultaneously with the grinding thereof to obtain a true andperfect seat for each valve.

Another feature of the invention consists in constructing the machinesuch that each of the individual mechanisms associated with each valvewill be maintained in alignment with the valves.

Still a further feature of the invention consists in the means fornormally maintaining the valve driving members in yielding engagementwith the several valves.

The full nature of the invention will be understood from theaccompanying drawings and the following description and claims.

In the drawings, Fig. 1 is a side elevational view of the inventionshowing the same applied to a multi-valve cylinder head. Fig. 2 is atransverse sectional view taken on the line 2-2 of Fig. 1 and in thedirection of the arrows. Fig. 3 is an elevational view of the right handend of the invention, as illustrated in Fig. 1. Fig. a is a sectionalview taken on line 4-4 of Fig. 3 and in the direction of the arrows andillustrates the means for supplying power to the mechanism and means forrotating the valves during the grinding.

In the drawings 10 indicates a cylinder head or block provided with aplurality of valves 11. Each valve 11 is provided with a groove 12 and acentering pin hole 13, as well as the stem 14 and the seat portion 15.

The cylinder block or head 10 is also providedwith a seat 16, andassociated with the valve and the block is the usual spring means 17 forseating saidvalve. All of the foregoing construction is old in the artand needs no further explanation. The invention is illustrated asapplied to an internal combustion engine, the cylinder head of whichcontains over-head valves, and said valves in the present instance aresixteen in number, four of which are associated with each of the enginecylinders, two being the exhaust valves and two being the intake valves.However, the principal construction of the machine may be applied to anymulti-valve engine for simultaneously grinding all valves thereofwithout departing from the broader features of this invention.

The machine constitutes a skeleton framework provided with an operatingmechanism, and said framework in the present instance comprises a baseplate 20 in spaced and parallel relation with a second plate 21, saidplates being secured together in said spaced relation by the standardportions 22. The standard portions are preferably tubular so as toreceive bolt members 23 by which the skeleton framework is secured toand upon the engine head 10 by the nuts 24. The framework of thegrinding mechanism is thus rigidly secured to the cylinder head 10 andin spaced relation therewith by means of the tubular spacing standards25, associated with the framework 21. As illustrated in Figs. 1 and 3,it will be understood that the bolts 23 are so positioned that the sameare receivable by the holes by which the cylinder head is secured. tothe cylinder block by other bolts means. It will, of course, beunderstood that this machine is used chiefly in quantity produc tion,and, therefore, each skeleton framework is constructed to correspond toeach of the cylinder heads to be associated therewith, but it will beunderstood that all of the multiple grinding machines are constructed ina similar manner, barring dimensions and the relative positioning of theseveral parts.

The mechanism associated with each valve to grind the same comprises avalve driver 30 provided with the usual driving face 31 and centeringtooth 32. The valve driver 30 is provided with an annular collar portion33 and a stem portion 34:. Associated with each valve driver is a driveshaft 35, which drive shaft is hollowed out at 36 to form a springchamber 37 in which the spring 38 is positioned, one end of said springbearing against the endof the opening or chamber 37 and the other end ofsaid spring bearing against the collar portion 33, which collar portionis slidable in the chamber portion 37. The drive shaft is also recessedat 39, which recess communicates with the chamber Wand is positionedcentrally thereof. The recess 89 receives and slidably supports the stem34% of the valve driver. Thus. the walls of the recess 39 and the wallsof the chamber 37, by means of the collar 33 and the'stem 34-, axiallyalign the valve driver with the drive shaft. The drive shaft 35 isslidably mounted in the frame 21. the latter being provided with thebushing 40 to facilitate said. slidable movement. The plate 20 isalsoprovided with a bushing 4:1. and the shaft 35 extends through thebushing. Thus, the shaft 35 is maintained in alignment the parallelplates 20 and 21. The shaft 35 is provided with a grooved portion 42 inthe groove 43 of which is positioned the div'ded yoke -14. which oke iscarried by a lifting or elevating arm aid arm being rigidly secured to arock shaft 46. by the bolts or set screws 46 which rock sh aft ismanually rocked by means of the hand lever 47. Thus, when the handle l-lisactuatech it willbe understood that the valve driver is elevated. Theshaft 16 is rotatably supported by means of the brackets 48 secured toand upon the frame 20. Upon the shaft 46 is another arm 49, which armbears against one end of the spring 50. The spring 50 is concentric withand mounted upon a bolt 51. which bolt is supported upon the framework20 in any suitable manner. The tension of the spring 50 is regulated bymeans of the washer 52 and a wing nut 53 said washer retaining one endof the spring 50 the other end, as hereinbefore stated. bearingupon thearm l-Q. Thus. the spring 50 is adapted to maintain the drive shaft 35.in the lower position through the arm 49. shaft 46 and arm 45.

Since one valve driver has been descr bed in detaih'including the meansfor elevatingand the means for yieldingly maintaining the driver in thelowered position. a further description of the other valve drivers andthe operation thereof will be omitted, it will be understood that asillustrated in the clrawings a plu ality of valve drivers are adapted tobe associated with the rockin shaft to. the elevating handle 4:7 and theadjustable yielding maintaining spring 50.

The means for oscillatingthe valve driver 30 comprises a long pinion 55,which long pinion is suitably secured or formed upon the drive shaft 35.

and transmits motion from the drive shaft to the valve driver 30 bymeans of a pin and slot connection, said drive shaft being slotted at 54and said valve drive stem being provided with a key 154 seatable in theslot 54:. A rack 56 is slidably supported upon a bracket 57. The rack 56is provided with an elongated slot 58 through which extends a pin orbolt 59 provided with the nut 60 or equivalent means may be substitutedso as to slidablv support said rack 56 upon the bracket 0 and guide thesame as well. The rack 56 is provided with teeth adapted to engage theteeth of the long pinion and since the pinion 55 is a long pinion, itwill be understood that the shaft 35 may be elevated or lowered withoutremoving the pinion from the rack.

The means for reciprocating the rack is as follows: Depending from thebase plate 20 are a plurality of brackets 81 which support the guide rod62. Upon the guide rod 62 is slidably supported a carriage member 63.The carriage member 63 is provided with an elongated slot or opening Getin which is positioned a circular cam member (35. The circular cammember 65 is eccentrically positioned with respect to the rotating shaft66. which. shaft 66, if desired. may be. and preferably is maintained infixed and aligned position by means forwardly extending brackets 67formed upon or otherwise secured to the base plate 2']. The rack 56 issuitably secured to the reciprocating carriage 3 such that rotarymovement of the shaft 66 will be transformed by means of the eccentriccam 65 into a reciprocating motion which is transmitted to the rack 56.

The means for indexing or rotating the drive shaft'35 so that the valvewill not be ground into one position but will be indexed or rotatedwhile the grinding valve is being oscillated. comprises in this instancemeans associated with the rack 56 and reciprocating carriage 63. Thismeans comprises screw 68 suitably secured to and carried bv the carriage63, which screw member may be revolved by means of the crank handle 69.A. nut member '70 is similarly threaded and adapted to receive the screwmember 68. The nut member 70 is rigidly secured to the rack 56 by meansof the bolt and nut 71 and 72 respectively. Thus. rotation of the crankhandle 69 will move the carriage G3 longitudinally of said rack. or viceversa. thus rotating the pinion 55. and therefore. the valve 1?].Rcciprocation of the rackoti thereupon will grind the valve 53 in thenew position.- 30th rotation and reciprocation may. if desired. occursimultaneouslv. Furhermore, if do sired, the rotational 'eaturehereinbefore described instead of beingmanually operated. may be;mechanically operated and autoinatic. lVhen automatically rotated orindexed, automatic means should be provided for returning the rack toits initial position upon the complete rotation of the several valves15.

As shown clearly in Figs. 2 and 3, the several pinions are so positionedin alignment with each other that a single rack serves to drive saidvalve drivers. Similarly, since opposite each valve driver there ispositioned a second valve driver, it will be understood that a singlerack provided with teeth upon opposite sides thereof will be sufficientfor driving all of said valve drivers simultaneously. Similarly, sincethe indexing mechanism is associated with the single and common rack,all of the valve drivers will be simultaneously indexed. If desiredinstead of the dual yielding maintaining springs 50 and the dualelevating levers 4:7, a single spring member may be used and a singlehandle member may be used without departing from the broader features ofthe invention.

In certain multi-valved motors, one or more valves is always in theelevated position.

With motors of this type, the respective set screws 46 may be loosened,thereby permitting the valve to remain in the elevated position duringthe grinding operation without unduly compressing the spring 38 orrocking the shaft 46 so as to cause the other drivers to becomedisengaged from their respective valves. After all the seated valveshave been ground, rotation of the engine crank shaft the proper angulardistance will close the unground valves and open one or more of theother valves. The properset screws -16 are then loosened and thosepreviously loosened are again tightened and the valves which wereoriginally in open position are ground.

While the invention has been described in great detail, it will beunderstood that many modifications thereof are possible and will readilysuggest themselves to those skilled in the art, a few being suggestedherein, and all of these modifications are considered to be within thebroad purview of this invention, reference being had to the appendedclaims.

The invention claimed is:

1. In a valve grinder, a frame, avalve engaging and driving member, aholder in said frame for said driving member, a pin and slot connectionbetween said holder and said valve engaging member permittinglongitudinal but preventing rotational movement therebetween, yieldingmeans associated with said valve engaging member and said holder fornormally maintaining the valve engaging member in valve engaging ingmember, a pin and slot connection between said holder and said valveengaging member, yielding means associated with said valve engagingmember and said holder, means for oscillating said holder, means forraising said holder, and other yielding means for normally maintainingsaid valve engaging member in the lowered position.

3. In a valve grinder, a plurality of valve engaging and drivingmembers, gear means associated with said valve driving members, othergear means in mesh with said first mentioned gear means for oscillatingsaid valve driving members, a single means for elevating all of saidvalve driving members, and a single means for normally maintaining allof said valve driving members in the valve engaging position.

at. In a valve grinder, a pair of valve engaging and valve drivingmembers, a pinion associated with each valve member, a rack positionedbetween said pinions and provided with gear teeth upon opposite sides inmesh with said pinions.

5. The combination with an internal com bustion engine, including a pairof valves, of a valve grinding mechanism for simultaneously grindingeach of said valves, said mechanism comprising a pair of supportingplates in spaced relation with each other and rotatably supporting apair of valve engaging and valve driving members in alignment with thevalves, means for driving said valve engaging and valve driving members,said driving means being positioned between said spaced supportingplates and supported thereby and between said valve engaging and valvedriving members, and means associated with said plates for securing thegrinding mechanism to the internal combustion engine.

6. In a valve grinder, a plurality of valve engaging and drivingmembers, gear means associated with said valve driving members fordriving the same, means for raising and lowering said valve drivingmember, and

means for maintaining one of the valve driving members in the elevatedand non-grindingposition, and other of the valve driving members in thelowered and valve grinding positions.

In witness whereof, I have hereunto affixed my signature.

ROBERT M. ROOF.

